diff --git a/glm/gtc/round.inl b/glm/gtc/round.inl
index 94fdd54b..988c64a1 100644
--- a/glm/gtc/round.inl
+++ b/glm/gtc/round.inl
@@ -30,8 +30,9 @@
 /// @author Christophe Riccio
 ///////////////////////////////////////////////////////////////////////////////////
 
-namespace glm
-{
+#include "../detail/func_integer.hpp"
+
+namespace glm{
 namespace detail
 {
 	template <typename T, precision P, template <typename, precision> class vecType, bool compute = false>
@@ -275,7 +276,7 @@ namespace detail
 	template <typename genType>
 	GLM_FUNC_QUALIFIER genType floorPowerOfTwo(genType value)
 	{
-		return isPowerOfTwo(value) ? value : highestBitValue(value);
+		return isPowerOfTwo(value) ? value : static_cast<genType>(1) << findMSB(value);
 	}
 
 	template <typename T, precision P, template <typename, precision> class vecType>
@@ -293,8 +294,8 @@ namespace detail
 		if(isPowerOfTwo(value))
 			return value;
 
-		genIUType const prev = highestBitValue(value);
-		genIUType const next = prev << 1;
+		genIUType const prev = static_cast<genIUType>(1) << findMSB(value);
+		genIUType const next = prev << static_cast<genIUType>(1);
 		return (next - value) < (value - prev) ? next : prev;
 	}
 
diff --git a/test/gtc/gtc_round.cpp b/test/gtc/gtc_round.cpp
index aa6cf1a1..bfb7e552 100644
--- a/test/gtc/gtc_round.cpp
+++ b/test/gtc/gtc_round.cpp
@@ -174,7 +174,7 @@ namespace isPowerOfTwo
 	}
 }//isPowerOfTwo
 
-namespace ceilPowerOfTwo
+namespace ceilPowerOfTwo_advanced
 {
 	template <typename genIUType>
 	GLM_FUNC_QUALIFIER genIUType highestBitValue(genIUType Value)
@@ -290,6 +290,72 @@ namespace ceilPowerOfTwo
 		Error += test_int32();
 		Error += test_uint32();
 
+		return Error;
+	}
+}//namespace ceilPowerOfTwo_advanced
+
+namespace roundPowerOfTwo
+{
+	int test()
+	{
+		int Error = 0;
+		
+		glm::uint32 const A = glm::roundPowerOfTwo(7u);
+		Error += A == 8u ? 0 : 1;
+		
+		glm::uint32 const B = glm::roundPowerOfTwo(15u);
+		Error += B == 16u ? 0 : 1;
+
+		glm::uint32 const C = glm::roundPowerOfTwo(31u);
+		Error += C == 32u ? 0 : 1;
+		
+		glm::uint32 const D = glm::roundPowerOfTwo(9u);
+		Error += D == 8u ? 0 : 1;
+		
+		glm::uint32 const E = glm::roundPowerOfTwo(17u);
+		Error += E == 16u ? 0 : 1;
+		
+		glm::uint32 const F = glm::roundPowerOfTwo(33u);
+		Error += F == 32u ? 0 : 1;
+		
+		return Error;
+	}
+}//namespace roundPowerOfTwo
+
+namespace floorPowerOfTwo
+{
+	int test()
+	{
+		int Error = 0;
+		
+		glm::uint32 const A = glm::floorPowerOfTwo(7u);
+		Error += A == 4u ? 0 : 1;
+		
+		glm::uint32 const B = glm::floorPowerOfTwo(15u);
+		Error += B == 8u ? 0 : 1;
+		
+		glm::uint32 const C = glm::floorPowerOfTwo(31u);
+		Error += C == 16u ? 0 : 1;
+		
+		return Error;
+	}
+}//namespace floorPowerOfTwo
+
+namespace ceilPowerOfTwo
+{
+	int test()
+	{
+		int Error = 0;
+		
+		glm::uint32 const A = glm::ceilPowerOfTwo(7u);
+		Error += A == 8u ? 0 : 1;
+		
+		glm::uint32 const B = glm::ceilPowerOfTwo(15u);
+		Error += B == 16u ? 0 : 1;
+		
+		glm::uint32 const C = glm::ceilPowerOfTwo(31u);
+		Error += C == 32u ? 0 : 1;
+		
 		return Error;
 	}
 }//namespace ceilPowerOfTwo
@@ -379,8 +445,11 @@ int main()
 	int Error(0);
 
 	Error += isPowerOfTwo::test();
+	Error += floorPowerOfTwo::test();
+	Error += roundPowerOfTwo::test();
 	Error += ceilPowerOfTwo::test();
-
+	Error += ceilPowerOfTwo_advanced::test();
+	
 #	ifdef NDEBUG
 		Error += ceilPowerOfTwo::perf();
 #	endif//NDEBUG